In his memoirs, Usamah ibn Munqidh narrates the following incident (which happened during the reign of the Crusaders in Levant) while explaining the fact that the Crusaders seriously lagged in the field of Medicine:
“They brought a Frankish physician to treat a woman afflicted with imbecility.
He examined the woman and said, ‘This is a woman in whose head there is a devil which has possessed her. Shave off her hair.’ Accordingly they shaved it off. The physician then said, ‘The devil has penetrated through her head.’
He therefore took a razor, made a deep cruciform incision on it, peeled off the skin at the middle of the incision until the bone of the skull was exposed and rubbed it with salt. The woman expired instantly”